are you positive that it is a lite plus v2, i have one as well(ehpro) and it only has one hole on the side for air intake, and on the bottom it has a fill screw and airflow adjustment screw, and of course the 510 pin that makes contact with the mod, that being said i know theres an improved version they released, not sure of the specifics of it but i know it has added airflow or sumthing along those lines, maybe thats it, if its leaking tho that typically means the coil and wick or too close to the center hole on the deck, thus letting e-liquid to pull and leak down the 510 post and out any holes can be allieviated by simply raising your coil a bit higher, ive heard to leave it almost touching the center post but my experience has been that it works better when raised almost past the height of the screws, it can also mean there is not enough wick in the coil and the eliquid is flooding the chamber rather than being absorbed by the wick, hope that helped gonna go do a search now and try to find what version of kayfun u have